What term describes the inflow of assets resulting from selling a product or providing a service?

The term that best describes the inflow of assets resulting from selling a product or providing a service is "income." Income refers to the revenue generated from the core activities of a business, such as sales of goods or services, which ultimately contributes to the financial health and sustainability of an organization. This inflow is vital as it allows a business to cover its expenses, invest in growth, and reward its stakeholders.

In contrast, the other terms indicate different financial aspects: "cost" refers to the expenditure incurred in the production of goods or services, "expense" signifies the costs that have been consumed or used in the course of earning income, and "asset" is something of value owned by the business. Therefore, the specific action of generating money through sales or services aligns precisely with the definition of income.